Our Doctors

With ear, nose and throat conditions, you need a team of otolaryngologists and audiologists who are experienced and provide caring and supportive treatment. Cross Timbers ENT cares about our patients and is here to help you diagnose and treat your health condition. We look forward to helping all our patients improve their quality of life.

Meet our Doctors

James F Leffingwell, M.D.

James F Leffingwell, M.D.

Founder of Cross Timbers ENT, Dr. James Leffingwell is a board-certified ENT specialist with more than 20 years experience. After receiving his medical degree from the university of Cincinnati College of Medicine in Ohio, he moved to Texas to complete an internship in general surgery and a residency in otolaryngology at the University of Texas medical Brand at Galveston.

Dr. Leffingwell is board-certified in otolaryngology and competed post-graduate work in endoscopic sinus surgery. His career interests include endoscopic surgery, nasal reconstruction, and problems associated with sinus problems, including snoring and sleep disorders.

A native of Ohio, Leffingwell graduated with highest honors from Denison University in Granville, Ohio, in 1977.

Luke Shellenberger, M.D.

Luke Shellenberger, M.D.

Luke Shellenberger, M.D., completed his otolaryngology-head and neck surgery residency at the University of Iowa, where he trained at the University of Iowa Hospitals and Clinics and the Children’s Hospital of Iowa. He received the 2005 Alfreda Van Wart Award for clinical resident research, as well as the 2003 Resident Teaching Award. Prior to surgical residency training, Dr. Shellenberger obtained his M.D. from Baylor College of Medicine, where he was an Alpha Omega Alpha honors graduate and was the Exceptional Graduate in Otolaryngology-Head and Neck Surgery for 2001.

A native of College Station, Dr. Shellenberger attended Baylor University, where he graduated Summa Cum Laude in 1997.

Dr. Shellenberger’s professional interests include pediatric and general otolaryngology, especially in the surgical treatment of hearing loss, head and neck and thyroid cancers, and facial reconstruction. He is active in several professional societies, including the American Academy of Otolaryngology, the Texas Medical Association, Board Certified in Sleep Medicine, and the Tarrant County Medical Society. He has been invited to present papers at several national academy meetings and has published research articles in a number of national journals. His research interests include advances in the treatment of vocal cord paralysis and management of pain after tonsillectomy.

Beyond his practice in Mansfield and Arlington, Dr. Shellenberger enjoys spending time with his two daughters, Caroline and Audrey and his son, Alex.

Allis H. Cho, M.D.

Allis H. Cho, M.D.

Dr. Allis Cho graduated from the University of Texas at Austin in 2002 and attended medical school at UT Southwestern in Dallas. She then completed her otolaryngology residency at Louisiana State University Health Sciences Center in Shreveport. Although a native of Los Angeles, Dr. Cho decided to return to Texas to start her practice.

In addition to general otolaryngology, her specialty interests include otology, allergy and sinus disease, facial plastics, and laryngology. Dr. Cho is a member of American Academy of Otolaryngology – Head & Neck Surgery and Texas Medical Association.

When not at work she enjoys reading, tennis, photography and traveling.

Jonathan Wu M.D.

Jonathan Wu M.D.

Dr. Jonathan Wu is a Board Certified Otolaryngologist. He treats both pediatric and adult patients. He has interests in all aspects of Otolaryngology including chronic ear infections, hearing loss, nasal congestion, recurring sinus infections, tonsil/throat issues, and thyroid/parathyroid disorders.

He graduated from the University of Texas at Austin in 2004. He received his medical degree from UT Southwestern Medical School in Dallas in 2008. After completing his residency in Otolaryngology at West Virginia University, he returned to the DFW area to start his practice.

Dr. Wu is a member of the Tarrant County Medical Society, Texas Medical Association, and the American Academy of Otolaryngology – Head and Neck Surgery.

He enjoys spending his free time with his wife and daughter. They are expecting their second daughter in March.

Meet our Audiologists

Allison Hampton Farrell, Au.D., CCC-A, FAAA

Allison Hampton Farrell, Au.D., CCC-A, FAAA

Doctor of Audiology, Allison Farrell, Au.D., is a clinical audiologist at Cross Timbers Ear, Nose & Throat. Dr. Farrell graduated from The University of Texas at Austin with a Bachelor of Science in Communication Sciences and Disorders, and she received her Doctorate in Audiology from the University of Texas at Dallas.

Dr. Farrell is a fellow of the American Academy of Audiology and member of the American Speech-Language-Hearing Association, the American Auditory Society, and the Texas Academy of Audiology. She is licensed to practice Audiology in the state of Texas and holds the Certificate of Clinical Competency through the American Speech-Language-Hearing Association.

Dr. Farrell performs comprehensive diagnostic hearing evaluations, as well as comprehensive hearing aid evaluations, fitting, and verification. Prior to joining Cross Timbers ENT, her extensive clinical experience included a variety of diagnostic testing, as well as hearing aid and cochlear implant services. She has been with Cross Timbers ENT since June 2008.

Marla Gracia, Au.D., CCC-A

Marla Gracia, Au.D., CCC-A

Dr. Marla Gracia joined Cross Timbers Ear, Nose, and Throat as a clinical audiologist in April, 2011. A native of Cleveland, Ohio, Dr. Gracia graduated Summa Cum Laude from Baldwin-Wallace College with a Bachelor of Arts in communication disorders. Her doctoral studies in audiology were completed at the University of North Texas. She is licensed to practice audiology in the states of Texas and holds the Certificate of Clinical Competency through the American Speech-Language-Hearing Association.

Eric Reynolds

Eric Reynolds

I’m a native Texan born and raised in Richardson. I earned a Masters degree in Speech and Hearing Science from Texas Tech University (Go Red Raiders!) and a Doctoral degree in Audiology from the University of Florida (Go Gators!). I’m a state licensed Audiologist and I’ve been providing hearing care for 30 years. I find the profession of Audiology rewarding because everyday I have the privilege of making a difference in the lives of others through the provision of hearing care, specifically in the areas of hearing loss prevention, detection, diagnosis, treatment and education.

I believe that a person’s connection to others and to the world is what matters most in life. Unfortunately, hearing loss weakens those connections. That’s why I strive, through the practice of Audiology, to help individuals connect, reconnect, and stay connected to the people and things that matter most to them.

My professional mission is to help you hear your very best so you may experience the joy of hearing wherever life takes you. If you want to prevent hearing loss, determine if you have a hearing loss, or want to improve your quality of life through better hearing, I welcome the opportunity to serve you.

When not providing hearing care, I enjoy spending time with my beloved wife and four children. A few of my favorite things include: early morning Bible quiet time and Sunday church service; watching and playing football and baseball; listening to music and building my record collection; reading and passing time in Barnes & Noble; watching classic movies; photography; bird watching; antique shopping; fellowship and coffee at Starbucks; cooking breakfast; and dining out.